Auto merge of #99953 - cjgillot:in-path-always, r=petrochenkov

Always create elided lifetimes, even if inferred.

`PathSource` gives the context in which a path is encountered.  The same `PathSource` is used for the full path and the `QSelf` part.

Therefore, we can only rely on `PathSource` to know whether typechecking will be able to infer the lifetimes, not whether we need to insert them at all.

Fixes rust-lang/rust#99949

Author: bors